Search for problems with the Phillips Twin-Eye sensor. In a nutshell, picking up the mouse causes the cursor to jump down and to the left or right depending on how the mouse is designed, and on certain surfaces lifting the mouse a certain distance can cause the mouse to stop tracking for a moment. The other major problem I had was that rapidly clicking one of the mouse buttons caused the cursor to jitter around, making it difficult to aim precisely. I'm not sure if that was a problem with the physical design of the mouse or another sensor issue (people have reported similar cursor jitter issues with other Twin-Eye products like the Razer Lachesis), but either way, it was a nuisance.

Personally i love my Sentinel Advance and I've had no issues with it. If i had to say something its that the coating on the top of the mouse is pealing, but this would be hard to put in a review as it only happened after 3 months.